<template>
	<view>
		<!-- 搜索组件 -->
		<my-search @click="goToSearch"></my-search>
		<view class="scroll-view-container">
		      <!-- 左侧的滚动视图区域 -->
		      <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
		       <block v-for="(item,i) in cateList" :key="i">
				   <view :class="['left-scroll-view-item',i === active ? 'active' : '']" @click="changId(i)">{{item.cat_name}}</view>
			   </block>
				
		      </scroll-view>
		      <!-- 右侧的滚动视图区域 -->
		      <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
		      <!-- 二级分类列表 -->
				<view class="right-level2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<view class="right-lel-item">{{ item2.cat_name}}</view>
					<view class="right-level3-list">
						<!-- 三级分类列表 -->
						<view class="right-level3" v-for="(item3,i3) in item2.children" :key="i3"  @click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon"></image>
							<text>{{ item3.cat_name}}</text>
						</view>
					</view>
				</view>
				
		      </scroll-view>
		    </view>
	</view>
</template>

<script>
	import badgeMix from '../../mixins/tabBar-badge.js'
	export default {
		mixins:[badgeMix],
		data() {
			return {
				wh: 0,
				active:0,
				cateList: [],
				cateLevel2:[],
				scrollTop:0
			};
		},
		   onLoad() {
		      // 获取当前系统的信息
		      const sysInfo = uni.getSystemInfoSync()
		      // 为 wh 窗口可用高度动态赋值
		      this.wh = sysInfo.windowHeight - 50
			  this.getCateList() 
		    },
			methods: {
			  async getCateList() {
			    // 发起请求
			    const { data: res } = await uni.$http.get('/api/public/v1/categories')
			    // 判断是否获取失败
			    if (res.meta.status !== 200) return uni.$showMge()
			    // 转存数据
			    this.cateList = res.message
				this.cateLevel2 = res.message[0].children
				
			  },
			  goToSearch(){
			  	uni.navigateTo({
			  		url:'/subpkg/search/search'
			  	})
			  },
			  changId(i){
				  this.active = i
				  // 为二级分类列表重新赋值
				  this.cateLevel2 = this.cateList[i].children
				  this.scrollTop = this.scrollTop === 0 ? 1:0
			  },
			 gotoGoodsList(item3){
				 uni.navigateTo({
				 	url:'/subpkg/goods_list/goods_list?cid=' + item3.cat_id
				 })
			 }
			}
	}
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;

  .left-scroll-view {
    width: 120px;

    .left-scroll-view-item {
      line-height: 60px;
      background-color: #f7f7f7;
      text-align: center;
      font-size: 12px;

      // 激活项的样式
      &.active {
        background-color: #ffffff;
        position: relative;

        // 渲染激活项左侧的红色指示边线
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
  
}
.right-lel-item{
	  font-size:12px;
	  text-align:center;
	  font-weight:bold;
	  padding:15px 0;
  }
  .right-level3-list{
	  display: flex;
	  flex-wrap: wrap;
  }
  .right-level3{
	  width: 33.33%;
	  display: flex;
	  flex-direction: column;
	  align-items: center;
  }
  image{
	  width: 60px;
	  height: 60px;
  }
  text{
	  font-size: 12px;
  }
</style>
